JAVASCRIPT

js array index

const beasts = ['ant', 'bison', 'camel', 'duck', 'bison'];

console.log(beasts.indexOf('bison'));
// expected output: 1

// start from index 2
console.log(beasts.indexOf('bison', 2));
// expected output: 4

console.log(beasts.indexOf('giraffe'));
// expected output: -1

js Arrays indexOf

function quickCheck(arr, elem) {
  if (arr.indexOf(elem) >= 0) {
    return true;
  }
  return false;
}
console.log(quickCheck(["squash", "onions", "shallots"], "mushrooms"));

js Arrays indexOf

function quickCheck(arr, elem) {
  return arr.indexOf(elem) >= 0 ? true : false;
}
console.log(quickCheck(["squash", "onions", "shallots"], "mushrooms"));

js Arrays indexOf

function quickCheck(arr, elem) {
  return arr.indexOf(elem) != -1;
}
console.log(quickCheck(["squash", "onions", "shallots"], "mushrooms"));

array index javascript

let fruits = ['Apple', 'Banana']
let first = fruits[0]
// Apple

let last = fruits[fruits.length - 1]
// Banana

index javascript array

Index Javascript